/*
 ***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/epl-v20.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2005 David Corbin <dcorbin@users.sf.net>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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package org.jruby.test;

import junit.framework.TestCase;
import org.jruby.Ruby;
import org.jruby.RubyArray;
import org.jruby.RubyException;
import org.jruby.RubyString;
import org.jruby.api.Access;
import org.jruby.exceptions.RaiseException;
import org.jruby.runtime.ThreadContext;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.List;

import static org.jruby.api.Create.newString;
import static org.jruby.api.Error.argumentError;

public class TestRubyException extends TestCase {

	private Ruby runtime;
	private ThreadContext context;
	private RubyException exception;

	public void setUp() {
		runtime = Ruby.newInstance();
		context = runtime.getCurrentContext();
		exception = new RubyException(runtime, Access.getClass(context, "StandardError"), "test");
	}

	public void testToJava() {
		assertNotNull(exception.toJava(Object.class));
		assertSame(exception.toThrowable(), exception.toJava(Object.class));

		Object throwable = exception.toJava(RaiseException.class);
		assertNotNull(throwable);
		assertTrue(throwable instanceof RaiseException);

		throwable = exception.toJava(RuntimeException.class);
		assertTrue(throwable instanceof RuntimeException);
	}

	public void testConcreteToJava() {
		RaiseException raise = argumentError(context, "BLAH");
		assertSame(raise, raise.getException().toJava(Throwable.class));

		assertNotNull(raise.getException().toJava(Object.class));
		assertSame(raise, raise.getException().toJava(Object.class));

		assertSame(raise.getException(), raise.getException().toJava(org.jruby.RubyObject.class));
	}

	public void testPrintBacktrace() {
		setBackTrace(18);
		
		String[] lines = printError();

		assertEquals(expectedTraceLine(0), lines[0]);
		assertEquals(expectedTraceLine(RubyException.TRACE_HEAD), lines[RubyException.TRACE_HEAD]);
	}

	public void testPrintNilBacktrace() {
		exception.set_backtrace(context, context.nil);
		
		String[] lines = printError();
		
		assertEquals(0, lines.length);
	}

	public void testPrintBackTraceWithString() {
		exception.set_backtrace(context, RubyArray.newArray(runtime, newString(context, testLine(0))));

		String[] lines = printError();

		assertEquals(1, lines.length);
		assertEquals(expectedTraceLine(0), lines[0]);
	}

	private String[] printError() {
		ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(2048);
		PrintStream stream = new PrintStream(byteArrayOutputStream);
		exception.printBacktrace(stream);
		String output = new String(byteArrayOutputStream.toByteArray());
		if (output.trim().length() == 0) {
		    return new String[0];
		} else {
		    return output.split(System.lineSeparator());
		}
	}

	private void setBackTrace(int lineCount) {
		List traceLines = new ArrayList();
		for (int i=0; i<lineCount; i++) {
			traceLines.add(newString(context, testLine(i)));
		}
		exception.set_backtrace(context, RubyArray.newArray(runtime, traceLines));
	}
	
	private String expectedTraceLine(int index) {
		return "\tfrom " + testLine(index);
	}

	private String testLine(int i) {
		return "Line " + i;
	}
}
